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Rise of the apes.

I'll start off with the obvious one: a honkin' big asteroid might do the job. To kill off 99% of all humans it would need to be particularly honkin', though.

Nuclear war.

Diseases. Lots and lots of Diseases. Most likely would be a huge asteroid hitting us dab in the middle of China. Knocking us off into a spiral loop where we would instantly die. DEATH!

I hope that you die first!

Hmmm... Your link appears to be missing a letter, or am I just missing something?

Super volcanic eruptions that black out the sun and cool the planet. We all starve.

Missing something?

An asteroid, an volcanic eruption or the blackening of the sun are unlikely to extinct us, beacause we can predict them well enough to prepare ourselves. On the other hand my money would be on the diseases. Just think about the current problems with ebola or the multiresistant bacteria. There's some potential there ;)

A series of super volcanic eruptions due to all the ash buildup in the atmosphere and shock waves sent through our oceans causing tsunamis we could be wiped out entirely

Toba Volcano Super Eruption.... in the past it nearly kill all of human in this world (only near 15000 people who survived this)
Here is some link for further reading:
1.http://toba.arch.ox.ac.uk/
2.http://www.livescience.com/29130-toba-supervolcano-effects.html
3.http://en.wikipedia.org/wiki/Toba_catastrophe_theory

Nuclear war. Alien Invasion. Nuclear science gone wrong. Destruction by an army of rabid platypi. Zombie Dinosaurs. Did I cover all the usuals?

Disease, war, nukes, stupidity.

The unseen death!....viral / bacterial ninjas are at the top of the food chain so my money is on super pandemic

Plague Inc.

The return of Disco

Yellowstone eruption.

Diseases, most likely prospect are the "superbugs" immune to medicines. Mankind's foolishness and greed leading to war. Asteroids which either hit, or if big enough, fling the earth off it's rotation and fuck up the "Goldilocks conditions" that the Earth has, but that would kill everyone.

Well... in saints row IV zin attacks and zinyak destroys earth leaving only the main people alive (the president, shaundi, ben king, johnny gat, etc) for at least untill they finish creating time travelling. But my real answer would be a scientist creating a weird sciency thing that makes people be idiots (like patrick in spongebob) then things get wrong and it spreads causing humans to extinct because they are to stupid to live (like the dodo birds, they didnt have any enemies causing them to get stupid). Btw the whole thing I said was sarcasm

Yellowstone , wile improbable is still very possible, but I think we are more likely to kill ourselves mutual annihilation style .